A technical snag in the signalling system on the harbour line of the Central Railway (CR) delayed the suburban services during the evening peak hours by 30-45 minutes on Friday.
The services on the Western Railway (WR) and the main line of the CR too were running 15-20 minutes behind schedule owing to low visibility, signal failure and water-logging at some places.
The rain led to water-logging at Ravali junction between Wadala and GTB stations, which in turn led to the problem in the signalling system.
The trains were running on an alternative signalling system, because of which they had to halt near the red light for a few minutes.
The WR services were affected because of signal failure between Dadar and Matunga stations. Sandeep Silas, division railway manager (DRM) of Mumbai division, WR, said that only a few trains were delayed by 7-8 minutes.
Unit failure of a Panvel-bound train at Wadala added to the commuters' woes. Mukesh Nigam, CR DRM, said "Since the point zone at Wadala, where all machines are located, was water-logged. It disrupted the services."